/Engine/Source/Editor/ContentBrowserData/Public/ContentBrowserDataSource.h
Called to provide custom drag and drop handling when a drag event enters an item, such as performing validation and reporting error information.
True if this data source can handle the drag event (even if it won't because it's invalid), or false to allow another data source (or the default handler) to deal with it instead.
virtual bool HandleDragEnterItem ( const [FContentBrowserItemData](API\Editor\ContentBrowserData\FContentBrowserItemData) & InItem, const [FDragDropEvent](API\Runtime\SlateCore\Input\FDragDropEvent) & InDragDropEvent )